Malicious PDF — malware analysis report

Static analysis result for SHA-256 c446d9658e416a6a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 04:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89d995e83498a684f5fbe811ae76e2d2 SHA-1: 1590a579c6d89513c06a4749d4fc5461b204fb1e SHA-256: c446d9658e416a6a1b398c22e6f4b047b7f47bae83bd684a81f8d018f548e17a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of external URIs and a link farm structure, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains elements that, combined with the heuristics, point towards a deceptive download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=vidmate+apk+old+version PDF link annotation
    • http://futimisdev.com/userfiles/file/pevarapodifoza.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/nobemuponumijatigodil.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/57221774717.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-9/20210909021217842475.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/banuraputesitizejunonevav.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613b306faf594---zikirozegedojogave.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210904004515.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/rijefakawezituxizosiju.pdfIn PDF document text
    • http://melvin.cz/data/79472655253.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/56377890421.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/pumoketagogurilakexosepam.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/88675317728.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/80258318956.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/44204774079.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/wirivexusojad.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/xiroto.pdfIn PDF document text
    • https://cape-electronics.com/media/file/67276880563.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/77215356372.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210914_A413E149AF5270A9.pdfIn PDF document text
    • https://techlan.pl/files/file/39665168205.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/tezopanupusotokuvu.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/dugajume.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/80212361018.pdfIn PDF document text
    • https://sergiomauri.com/images/file/85974078413.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/kaxazotezulamojitusamimov.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 10680 bytes
SHA-256: 52d83236098242d477ef383eba9b807679ad03b084a5530b4aa32297ba88f559
font_01_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 17188 bytes
SHA-256: 652b98d6142a608df6a039c432347ec2ca5f51fe7a33d9305ea5e8404f4011d4
font_02_sfnt_off00011f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1